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Fluorite

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MGR718983

Fluorite

Description Tabs

Description
Locality: 
Rogerley Mine, Frosterley, Weardale, County Durham, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
15.5 × 8.9 × 6.3 cm
Description

A reakly impressive specimen from the old Rogerley Mine. The twin crystals show bottle green colour and switch to intense blue under daylight. Most material from the locality shows crystals with fuzzy centers, not so here: the crystals are water clear and faces show very good luster. Most specimen are filled with crystals and don't show any contrast to the matrix. So also this indicator is uncommon for the locality. The crystals are up to 20 mm on edges.

Mineral Data
What's on the rock

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Crystal System: 
Isometric
Hardness: 
4.0
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
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